INT 10 - VIDEO - SET MAPPING OF LCD HIGH INTENSITY ATTRIBUTES (CONV,CP386)
        AX = 1402h
        BL = function
            00h ignore high intensity attribute
            01h map high intensity to underscore
            02h map high intensity to reverse video
            03h map high intensity to selected alternate font
            B0h half intensity (Compaq)
            B1h toggle active intensity bit interpretation (CP386)

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